Construction workers are said be getting buzzed at Tribeca’s most buzzed-about building, 56 Leonard St., a k a the Jenga Tower.

Every condo in Herzog & de Meuron’s cantilevered 60-story building has been sold, except for one $47 million penthouse. But the buyers better hope its “Jenga blocks” don’t topple, given the amount of weed being smoked.

One neighbor said he rarely walks down Church Street without spotting — and smelling — some of the site’s 400 workers toking up.

“And this isn’t after they’ve clocked out. It’s in middle of the day,” the neighbor said. “The other day, several of them were standing in the shadow of the rising building with a cloud of pot smoke around them.”

You can just imagine a stoned worker going back to the site and saying, “Yo, dude, did I put those bolts in the elevator?”